Plsql code in select list

Question

My query is :
I am having table name room list which contain the information about rooms with
sitting capacity
name of rooms are fetch in select list :P1_ROOM_NAME which return the Room id to hidden item
:P1_ROOM_ID which is used for the third Select :P1_NO_OF_PARTICIPANTS
i am getting error in populating :P1_NO_OF_PARTICIPANTS
NO DATA FOUND AND I AS INVALID VARIABLE
I know No data found is due to :P1_ROOM_NAME IS NOT SELECTED FIRST
on page load.
Any Idea for the query of :P1_NO_OF_PARTICIPANTS
sample data and queries used
create table room_list
( room_id number,
  room_name varchar2(100),
  sitting_capacity
insert into room_list values(1,'a',3);
insert into room_list values(2,'a',1);
:P1_ROOM_NAME
SELECT ROOM_NAME AS D,ROOM_ID AS R
FROM ROOM_LIST
For Select List i used
:P1_NO_OF_PARTICIPANTS
Cascading lov used item P301_ROOM_ID
DECLARE
l_sitting_capacity varchar2(50);
begin
SELECT SITTING_CAPACITY into l_sitting_capacity
FROM ROOM_LIST
WHERE ROOM_ID=:P301_ROOM_ID;
FOR I IN 1..l_sitting_capacity
loop
RETURN
'select i as display ,i as return
from dual';
end loop;
end;

Answer 1

ReemaPuri wrote:
My query is :
I am having table name room list which contain the information about rooms with
sitting capacity
name of rooms are fetch in select list :P1_ROOM_NAME which return the Room id to hidden item
:P1_ROOM_ID which is used for the third Select :P1_NO_OF_PARTICIPANTS
i am getting error in populating :P1_NO_OF_PARTICIPANTS
NO DATA FOUND AND I AS INVALID VARIABLE
I know No data found is due to :P1_ROOM_NAME IS NOT SELECTED FIRST
on page load.
Any Idea for the query of :P1_NO_OF_PARTICIPANTS
Isn't that the wrong way round? Shouldn't the number of participants be identified first, so that the selection can be restricted to rooms with at least that capacity?
sample data and queries used
create table room_list
( room_id number,
  room_name varchar2(100),
  sitting_capacity
insert into room_list values(1,'a',3);
insert into room_list values(2,'a',1);
:P1_ROOM_NAME
SELECT ROOM_NAME AS D,ROOM_ID AS R
FROM ROOM_LIST
For Select List i used
:P1_NO_OF_PARTICIPANTS
Cascading lov used item P301_ROOM_ID
DECLARE
l_sitting_capacity varchar2(50);
begin
SELECT SITTING_CAPACITY into l_sitting_capacity
FROM ROOM_LIST
WHERE ROOM_ID=:P301_ROOM_ID;
FOR I IN 1..l_sitting_capacity
loop
RETURN
'select i as display ,i as return
from dual';
end loop;
end;
This code is completely nonsensical. The capacity of the room selected is retrieved, then you attempt a loop using that as the number of iterations, but the loop contains a RETURN statement that will exit the loop and terminate execution of the block on the first iteration. Finally, the value returned is the text of an invalid query on the DUAL table (there is no DUAL.I column...)
WHAT are you trying to do here?